Well I am still learning! Yey! Even at my age... ( late 40's )
So we have two major dimensions for propellers ( fixed pitch ! )
The width. ( Diameter of the swept circle ...)
The one revolution distance traveled forward or "pitch"
So a 8 x 4 propeller is 8" in diameter and has a full rotation pitch of 4".
( To clear up any issues with pitch: the propeller is an "air screw" and does exactly that.
So the the distance it travels in one rotation is the "pitch". If we were to look a stationary
propeller and then rotate it one turn it would move a linear column of air n inches... and this
would be it's pitch.)
So what do the numbers really mean?
Small diameter is less swept air, larger diameter is more swept air.
Small diameter at n rev's is less power use, large diameter at n rev's is more power use.
Small diameter will air brake less, large diameter will air brake more.
Less pitch is less air column shifted , more pitch is more air column shifted.
Less pitch is more linear torque/less rotational torque, more pitch is ~ versa.
Less pitch is more air braking at higher speed, more pitch is less air braking at high speed.
So a small diameter and low pitch prop will:
sweep not much air, use less power, air brakes less, shift less air column, more LT, less RT, more air braking. ( With respect to above table.)
and smaller props weigh less. obviously.
Props for climbing/prop hanging and props for high speed.
lets say we use an 11" prop in 4" inch pitch and in 8" pitch.
Ignoring all but the basics you will find the 4" prop will yank your plane along to a point then it won't go any faster, conversely the 8" will slowly fly up to a much higher top speed.
Want to have oodles of pull? Go for a lower pitch.
Want to fly fast? go for higher pitch.
Why is this important?
Well if you are flying your N28 at low speed and feel that it's just a gutless piece of crap...
maybe you have the wrong prop on....
( Imagine if you had the right one on... lower top speed BUT oodles of pull...)
Will prop specs get modeled in FC... causally wondering... he said reaching for the second Gin and tonic for the morning.... oh look the sun is out...
Props: the other other fixed wing...